Framing A Pitched Roof Over A Flat Roof

Pitch for a gable roof the most common is generally 1 4 or 1 3.

Framing a pitched roof over a flat roof.

I show how i construct it showning in detail how to do the lead flashing. Pitch can vary a great deal from a shallow slope up to a very steep pitch. Pitch also has its own denotation determined by the rise in inches in 12 inches. Created with wondershare filmora.

If the structure contains windows then you ll need a low pitch for example. A 900 square foot flat roof in the san francisco area made of concrete tiles costs. For instance a 4 12 pitch denotes. Using a pitch measuring tool that i d made we also determined that the exact pitch of the shed roof was 3 1 2 in 12.

To keep the porch roof framing as simple as possible we installed a structural ridge supported by posts at each end with the common rafters landing on top of the ridge. According to improve net s online roofing calculator a flat roof is significantly cheaper than a pitched roof. Yet for historic modern style buildings like this old house s cambridge tv project flat roofs are at the core of the architecture meant to reflect the broad horizontal lines of the natural landscape. Snow and rain which usually pile up on a flat roof run off the slanted roof thus prolonging the lifespan of the roof.

Of course you don t need to live in a modern house to deal with a flat roof. This is part two of the porch build where i am doing the roof. Most homeowners choose to convert a flat roof to a pitched one using a simple trussed roof with two angled planes. Blind valleys simplify framing.

Building a pitched roof over an existing flat roof it depends on a lot of variables like the condition of the existing flat roof including the state of the joints and the material its made of. Additional valleys angles and gables can be built into converted roofs as well but adding these elements may affect your project. Flat roofs aren t architecturally logical as rain and snow will shed much more quickly off a sloped roof. While that s the easiest route it s certainly not your only option.

Which is equal to 1 4 or 1 3 the total span of the building not counting any overhang.